## Chromosome Question

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Agronomy
Garter
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### Chromosome Question

Snapdragon has a diploid number of 16 chromosomes. How many sister chromatids are present in prophase?

I'm confused on this question...is the answer 32?

sachin
King Cobra
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Diploid number of 16 means

16*2=32 chromosomes

sister chromatids present in prophase=32*2=64..
Senior Education Officer, BNHS, India. www.bnhs.org

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Agronomy
Garter
Posts: 29
Joined: Wed Jan 17, 2007 5:04 am

### Thanx!

Why did you multiply the 16 x 2 and then by 2 again!?

If it has a diploid number of 16 chromosomes, then you would just multiply that by 2 to get the number of chromatids to get 32 right?

sachin
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:
Then in prophase 'I' shaped chromosome becomes doubled by DNA replication and become 'X' shaped due to presence of sister chromatid...

so I multiplied by 2 again.

Remember there two 'I' shaped chromosomes in general.."II"

Then after synthesis they become..."XX"

And after cell division they again come to..."II" ; "II"
Senior Education Officer, BNHS, India. www.bnhs.org

Bitter Truth!
Who says reason for world war III will be Petrol?
Reason lies in two words "Me and Mine".

Agronomy
Garter
Posts: 29
Joined: Wed Jan 17, 2007 5:04 am

Oh okay thanx!!!

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